<?php 
include './functions.php';
$arr = array(
	'a'=>'A',
	'b'=>'B',
	'c'=>array(
		'd'=>'D',
		'e'=>array('f'=>'F')
	)
);
function changeCase(&$array){
	$array = array_change_key_case($array,CASE_UPPER);
	foreach ($array as $k => $v) {
		if(is_array($v)){
			changeCase($array[$k]);
		}
	}
}
changeCase($arr);
p($arr);
 ?>